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M. SEIPP. I MULTITUBULAR BOILER.

No. 485,507. Patented Nov. 1, 1892.

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UNITED TATES PATENT OFFICE.

MAX SEIPP, OF BERLIN, GERMANY.

MULTITUBULAR BOILER.

SPECIFICATION forming part of Letters Patent No. 485,507, dated November1, 1892. Application filed June 1, 1892. Serial No. 435,151. (No modeh)This invention relates to steam-generatorsof the type wherein theheating-surface is to a great extent arranged on the water-tube system.In steam-generators of this class as ordinarily constructed theincandescent gases proceeding from the powers press upward and downwardbetween the heating-tubes, and in consequence of being too rapidlycooled more or less combustible matter passes away without beingconsumed, thick smoke and soot resulting. Consequently generators ofthis class can only be advantageously used with short-flamedcoal-anthracite or coke-and yield (permit of heating-surface) less steamthan many boilers in which the flames have freer play. 1

A steam-generator constructed according to my improved method isillustrated in the accompanying drawings, wherein-- Figure I is alongitudinal vertical section; Fig. II, a transverse vertical section onthe lines 00 00 y y, Fig. I; and Fig. III, a horizontal section on theline 2 2, Fig. I. Fig. IV is a transverse vertical section showing thesuperheating-pipes ff. Fig. V is a horizontal sectional View of thedevice.

The present construction of generator is more particularly intended foruse with fuel burning with a long flame, complete combustion of thegases taking place in the large combustion-chamber A, the heating-tubesD being so distributed along the walls of the same that the hot gasesare not compelled to pass between them, the greater portion of the heatconveyed by the gases being imparted to the tubes by radiation beforethe gases escape from the combustion-chamber and pass among thefeed-pipes 0, arranged behind the walls and toward the roof of the saidchamber. It further results from this system of working that thetemperature of the feedwater is raised to that of the generator ornearly so, and the greater part of the impurities contained thereinsolidified and depositedbefore the Water enters into circulation andreaches the steam-generating surfaces. The feed-pipes are arranged intwo separate systems, so that either one or the other set can be removedand cleaned without stopping or interfering with the effective workingof the generator. r

The drum E has a large steam-space and communicates by means of lateralenlargements 6 e and two water-chambers (Z d with the front and upperextremities of the two sets of inclined heating-tubes D D. The oppositeend of the steam and water drum E is in communication, by means of adownpipe e with the water-drum a to which two waterchambers 02 d areconnected. To these water-chambers the rear or lower extremities of thetwo sets of inclined heating-tubes D D are respectively attached andreceive their supply therefrom. I

Behind the fire-brick'walls B of the combustion-chamber are two sets offeed-pipes C, each fitted with stop-valves and independently connectedwith the generative portion of the boiler, so that either set may beshut off at will. These pipes may be horizontal, vertical, or inclined.

The steam after leaving the steam-dome E may be led through pipes ff,arranged in the -upper part of the brickwork-chamber, and

thus be dried or superheated. If, owing to proximity of the generator todwellings or for other reasons, it be deemed preferable, the steam andwater drum E may consist of a group of tubes and may be placed above theroof of the combustion-chamber while the heating-tubes are arrangedalong the walls on either side, as before described, or along the sidewalls and beneath the roof, the incandescent gases not circulating amongand between the tubes according to the usual practice but burning freelyin the combustionchamber and ultimately bathing the pipes containing thefresh feed-water.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is

1. In a steam-generator, the combination, with the co mbustion-chamberand the groups of water-tubes arranged on either side thereof, of theinner and outer walls of the compipes in the space between the inner andouterwalls of the combustion-chamber, substantially as described.

2. In a steam-generator, the combination, with the combustion-chamberand the groups of water-tubes arranged on either side thereof, of theinner and outer walls of the coinbustion-chaniber and thefeed-water-heating pipes in the space between the innerand outer wallsof the combustion-chamber, through which space the heated gasesultimatelypass, bathing the said heating-pipes, substantially asdescribed.

3. In a steam-generator, the combination, with the combustion-chamber,double walls surrounding said combustion-chamber, the groups ofwater-heating tubes D and D, arranged on either side within saidwater-chainber, the drum E, water-chambers d d, extending downward fromthe drum and connecting with the front upper ends of the water-heatingtubes, water-drum e connected with the drum E, and pipes (Z and (Z fromthe waterdrum e connecting with the rear lower ends of the water-heatingtubes D D, of the feedwater-heating tubes in the space between thedouble walls of the combustion chamber,

through which space the heated gases ultimately pass, substantially asdescribed.

4. In a steam-generator, the combination, with the combustion-chamber,double walls surrounding said co|nbnstion-chamber, the groups ofwater-heating tubes D and D, arranged on either side within saidwater-chamher, the drum E, water-chambers cl d, extending downward fromthe drum and connecting with the front upper ends of the water-heatingtubes, water-drum 0 connected with the drum E, pipes d and d from thewater-drum e connecting with the rear lower ends of the water-heatingtubes D D, the steam-dome E, and the superheating-pipesf, connected withthe said steam -dome and arranged within the upper part of thecombustion-chamber, of the feed-water-heating tubes in the space betweenthe double walls of the combustion-chamber, through which space theheated gases ultimately pass, substantially as described.

In witness whereof I have hereunto set my u hand in presence of twowitnesses.

MAX SEIPP.

Vitnesses:

PAUL FISCHER, W. HAUPT.

